Thank you very much Andreas! You're right. I've just tried rule-based label
with a large contours layer and difference in time consumption is notable.

So, in Lester's case, rule would be just:

"ELEV" % 1000 = 0

Regards

Carlos




2016-08-18 8:41 GMT-05:00 Neumann, Andreas <a.neum...@carto.net>:

> Hi Lester/Carlos,
>
> Even better would be to use a rule-based label (available since 2.14 I
> think).
>
> With rule-based labeling it is most likely a bit faster, since QGIS
> doesn't have to deal with all of the contours that are not a multiple of
> 1000.
>
> In your case, with the CASE statement it still has to process every
> contour line.
>
> Andreas
>
> On 2016-08-18 15:31, Lester Anderson wrote:
>
> Thanks Carlos, that worked fine
>
> On 18 August 2016 at 14:11, Carlos Cerdán <sig.up...@gmail.com> wrote:
>
> Hi Lester.
>
> I think you're close to do it. Try this label expression:
>
> case when "ELEV"%1000=0 then "ELEV" end
>
> Good luck
>
> Carlos
>
>
> 2016-08-18 7:49 GMT-05:00 Lester Anderson <arctica1...@gmail.com>:
>
>
> Hello,
>
> Is there a simple way of labelling only certain contours rather than all?
>
> I have set up bathymetry styling for thick contours (1000) and thin (100):
> "ELEV" % 1000 = 0  (thick)
> "ELEV" % 1000 <> 0 (thin)
>
> I would like to label only the 1000 contours, i.e. conditional labelling.
>
> Thanks
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